<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <p></p>

    <script>


        // dir()  显示一个对象身上的所有属性和方法

        console.log(console);

        const oDiv = document.getElementsByTagName('p')[0] ;
        console.dir(oDiv.constructor);   

    </script>
    
</body>
</html>